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You can board the ship to Helheim without killing all the Rangar Warriors or acquiring the other items.
Just go around the back and sneak through the trees to board the ship.
That is intentional for the poor lost souls who get glitches on mobile. I put that in for one of the betatesters who had a glitch they couldn't overcome. If it can happen to one person it can happen to many. It's because the "set visible" command sometimes gets bugged on mobile and if you can't see the monster, you can't kill it. And if you can't kill all the monsters you need to, you can't get to Helheim.